96 lines
2.8 KiB
Go
96 lines
2.8 KiB
Go
package middlewares
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/*
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Copyright 2024 Jonas Kaninda
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import (
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"fmt"
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"github.com/jkaninda/goma-gateway/pkg/logger"
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"github.com/jkaninda/goma-gateway/util"
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"net/http"
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"strings"
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"time"
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)
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// AccessMiddleware checks if the request path is forbidden and returns 403 Forbidden
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func (blockList AccessListMiddleware) AccessMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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for _, block := range blockList.List {
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if isPathBlocked(r.URL.Path, util.ParseURLPath(blockList.Path+block)) {
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logger.Error("%s: %s access forbidden", getRealIP(r), r.URL.Path)
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RespondWithError(w, http.StatusForbidden, fmt.Sprintf("%d you do not have permission to access this resource", http.StatusForbidden))
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return
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}
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}
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next.ServeHTTP(w, r)
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})
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}
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// Helper function to determine if the request path is blocked
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func isPathBlocked(requestPath, blockedPath string) bool {
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// Handle exact match
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if requestPath == blockedPath {
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return true
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}
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// Handle wildcard match (e.g., /admin/* should block /admin and any subpath)
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if strings.HasSuffix(blockedPath, "/*") {
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basePath := strings.TrimSuffix(blockedPath, "/*")
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if strings.HasPrefix(requestPath, basePath) {
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return true
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}
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}
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return false
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}
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func isProtectedPath(urlPath string, paths []string) bool {
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for _, path := range paths {
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return isPathBlocked(urlPath, util.ParseURLPath(path))
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}
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return false
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}
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// NewRateLimiter creates a new requests limiter with the specified refill requests and token capacity
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func NewRateLimiter(maxTokens int, refillRate time.Duration) *TokenRateLimiter {
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return &TokenRateLimiter{
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tokens: maxTokens,
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maxTokens: maxTokens,
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refillRate: refillRate,
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lastRefill: time.Now(),
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}
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}
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// Allow checks if a request is allowed based on the current token bucket
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func (rl *TokenRateLimiter) Allow() bool {
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rl.mu.Lock()
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defer rl.mu.Unlock()
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// Refill tokens based on the time elapsed
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now := time.Now()
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elapsed := now.Sub(rl.lastRefill)
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tokensToAdd := int(elapsed / rl.refillRate)
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if tokensToAdd > 0 {
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rl.tokens = min(rl.maxTokens, rl.tokens+tokensToAdd)
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rl.lastRefill = now
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}
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// Check if there are enough tokens to allow the request
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if rl.tokens > 0 {
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rl.tokens--
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return true
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}
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// Reject request if no tokens are available
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return false
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}
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